Blasting-cartridge



(No Model.)

J. E. EVANS. BLASTING CARTRIDGE.

No. 437,646. Patented Sept. 30-, 1890.

UNITED STATES- PATENT OFFICE.

JOSEPH E. EVANS, OF BEDFORD, INDIANA.

BLASTlNG-CARTRIDG E.

SPECIFICATION forming part of Letters Patent No. 437,646, datedSeptember 30, 1890. Y

Application filed December 16, 1889- Serial No. 333,893- (No model.)

.To all whom it may concern.-

Be it known that I, JOSEPH E. EVANS, a citizen of the United States,residing at Bedford, in the county of Lawrence and State of Indiana,have invented a new and useful Blasting-Chamber, of which the followingis a specification.

My invention consists, essentially, of a chamber and a close-fittingcap, so arranged as to form a confined space between the chamber andcap, the only communication to the outside being by an aperture let intothe side of the chamber, the said space adapted to receive a charge ofexplosive material and the aperture to receive a suitable fuse or wire,the object of my invention being, by the discharge of its explosivecontents and the consequent separation of the chamber and cap, toseparate solid masses of rock from their native ledges, a channelhaving, been previously constructed to snugly receive one or more of myblasting-chambers. I attain this object by the mechanism illustrated inthe accompanying drawings.

Figure l is atop view of my invention with the cap removed. Fig. 4 showsthe chamber and sling. Fig. 3 is an under view of the cap. Fig. 2 is avertical section of the invention on the line 0000 of Fig.1. 5 shows myinvention in position and ready to be discharged.

Similarletters refer to similar part-s throughout the several views.

The chamber A is formed out of solid metal, and its cavity is soconstructed as to receive snugly the cap B. A hole is formed at anypoint 0, giving access from Without to its space within, and yet so nearthe base as not to be obstructed by the edge of the cap when inposition. The cap B, adapted to fit into the chamber A, is soconstructed with a chamber in its base that while its upper surfaceforms a continuouslevel plane with the top surface of the margin of thechamber A, there is a space G between the cap and the chamber, the onlycommunication to which is through the ignition-hole at O, and this spaceis intended to contain the charge of explosive material to be used.

The entire blasting-chamber, when in position to be discharged, issuspended in the sling D, which consists of a strip of suitable materialbent at its center into a curve adapted to receive it, and the ends ofwhich are formed into eyes suitable to suspend the sling and chamber inthe channel previously prepared for their reception.

In using my mechanism the ledge to be operated upon is first channeledin any suitable manner to any required depth, depending upon thecharacter of the stone and the size of the piece to be detached. One ormore of my blasting-chambers, of a thickness correspending to the widthof the channel, is insorted and suspended at the required depth by meansof the sling D, which in turn is supported at the edges of the channelby the greater Width of the eyes 0 and 19. An igniting-fuse, or, ifpreferred, the Wire from an electric battery, is inserted in the hole atC and connected with the explosive charge. (If an electric wire be used,it should be insulated from the metal chamber by any suitable insulatingmaterial.) The charge is then exploded. The force of the explosionacting in the direction of least resistance will drive the chamber A andthe cap B asunder; but as no space intervenes between the Walls of stoneand the chamber and cap, respectively, if the force of the explosion besufficient the weaker part of the rock Will give way and be detached,and the use for which my mechanism is designed will be subserved.

It has been found necessary, in detaching pieces of rock in the form ofparallelopipedons, after channeling across the upper surface of theledge to drill a line of holes in the exposed side of the piece to bedetached at the required distance from the upper edge of the piece, andthen by means of Wedges and feathers to split the piecefrom its nativebed, and then by wedging or prying in the channel to detach the piecefrom its ledge. By using my device the piece need not be first detachedfrom its bed. The channel only is formed, and then my blasting-chamberinserted and discharged. The piece will then be found detached and evenremoved from its native bed.

In the construction of my blasting-chamber I do not restrict myself toany particular metal. Any strong tenacious metal will serve my purpose.I have found, however, that wrought-iron is most serviceable. Nor do Iconfine myself to the circular form for my blastingchamber. It may beconstructed round, square, or in any shape, and still not be at variancewith my invention, although I have found the round or cylindrical shapeto be best for the purposes of my invention, and the top and bottom areto be planes, flat and parallel.

Having thus described my invention, I claim as my own, and desire tosecure by Letters Patent 1. A removable blasting-chamber consisting of ametallic chamber, a hollow metallic cap fitting snugly into the saidchamber and by means of its hollow structure forming with the innersurface of the chamber a space confined except as to a small aperturenear the base of the chamber, all substantially as described.

2. The combination,in a blasting-chamber, of the hollow metallic chamberA, provided with an aperture at C, the cap B, fitting into said chamberand forming by its hollow character a confined space between it and thechamber, the sling D, adapted to support and carry the chamber upon theinner surface of its curve, all substantially as described.

3. A blasting-chamber consisting of a hollow case and a hollow cap orplug therefor, the lower surface of the case-and the upper surface ofthe cap being fiat and substantially parallel with each other, and anaperture leading through thewall of the chamber, said chamber beingadapted to receive an explosive charge, and said aperture adapted toreceive a feed therefor, in combination with a sling for supporting saidchamber, all substantially as described.

JOSEPH E. EVANS.

\Nitnesses: V

ALEXANDER WVEBsTER, MICHAEL N. MEssIcK.

